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 TM 55-1905-223-24-3
(13)
Position the valve seat insert in the counterbore.
(14)
Be sure that the chamfer on the insert is against the cylinder head.
(15)
Install the driver adapter and valve seat driver through the swivel.
(a) Hit the valve seat driver with a heavy hammer to install the valve seat insert into the counterbore.
(b) Ensure the valve seat goes to the bottom of the counterbore.
(c) Remove the adapter, driver, base, and swivel from the cylinder head.
CAUTION
Be careful not to damage the cylinder head when you stake the valve seat insert.
(16)
Use the staking tool driver and the staking tool to stake the valve seat insert in the cylinder head. If the staking
tool and driver are not available, use a punch to stake the valve seat insert. Be sure that the end of the punch
is round.
e. Valve Guides. Inspection and replacement procedures.
(1) Inspection.
(a) Check the inside diameter of the valve guide. Replace the guide if the bore is worn larger than 0.455 inch
(11.56 mm).
(b) Measure the bore at four points spaced 90 degrees apart to find if the bore is out-of-round. Check the full
length of the bore. Replace the guide if it is out-of-round.
(c) Visually check the guide for damage. Replace if damage.
(2) Replacement.
(a) Remove the worn valve guides. Use the valve guide mandrel to install the new guides.
(b) If the bore for the valve guide is damaged and is to be repaired, use the reamer to cut the bore to measure
0.760 to 0.761 inch (19.30 to 19.33 mm) inside diameter. Ensure the reamer cuts the entire bore. Remove
all sharp edges.
NOTE
If the damage to the valve guide bore is not removed by using the reamer, use the reamer to cut the
bore to the next largest size. Repeat steps (1) and (2) to cut the bore to measure 0.765 to 0.766 inch
(19.43 to 19.46 mm). Install the oversize valve guide. You can ream the hole in the valve spring
guides to measure 0.768 to 0.775 inch (19.51 to 19.63 mm) so the spring guides will fit the oversize
valve guides.
4-36
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